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Finding the Fourth Proportional to 659.67, 989.51 and 248.81

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Solution

The fourth proportional to 659.67, 989.51 and 248.81 is: 373.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.67 : 989.51 = 248.81 : x
  2. Step 2: Convert to fraction form
    659.67/989.51 = 248.81/x
  3. Step 3: Cross multiply
    659.67x = 989.51 × 248.81
  4. Step 4: Simplify right side
    659.67x = 246,193.79
  5. Step 5: Solve for x
    x = 246,193.79/659.67
  6. Step 6: Final answer
    x = 373.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.